WO2003107057A1 - Wavelength-tunable light source and wavelength-division multiplexed transmission system using the source - Google Patents

Wavelength-tunable light source and wavelength-division multiplexed transmission system using the source Download PDF

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Publication number
WO2003107057A1
WO2003107057A1 PCT/KR2003/000462 KR0300462W WO03107057A1 WO 2003107057 A1 WO2003107057 A1 WO 2003107057A1 KR 0300462 W KR0300462 W KR 0300462W WO 03107057 A1 WO03107057 A1 WO 03107057A1
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Prior art keywords
port
wavelength
multiplexer
optical signals
fabry
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PCT/KR2003/000462
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English (en)
French (fr)
Inventor
Chang-Hee Lee
Hyun-Deok Kim
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Korea Advanced Institute Of Science And Technology
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Priority to AU2003217510A priority Critical patent/AU2003217510A1/en
Publication of WO2003107057A1 publication Critical patent/WO2003107057A1/en

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/503—Laser transmitters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/506—Multiwavelength transmitters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/572—Wavelength control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/03—WDM arrangements
    • H04J14/0307—Multiplexers; Demultiplexers

Definitions

  • the present invention relates to a light source providing a wavelength- selective output.
  • a wavelength-tunable light source whose output wavelength can be externally controlled and a wavelength-division multiplexed (WDM) transmission system using the source.
  • WDM wavelength-division multiplexed
  • the light source providing output at a specific wavelength is one of the key-elements of a wavelength-division multiplexed transmission system , in which each channel is discriminated by its wavelength .
  • the light source of wavelength-division multiplexed transmission system should have a stable wavelength and a sufficient side mode suppression ratio(SMSR). It is also desirable to have a high output power and a narrow line width.
  • SMSR side mode suppression ratio
  • a distributed feed-back laser diode(DFBLD) is a representative light source in the prior art that meets the requirements described above.
  • DFBLD is very expensive and requires a complicated control process to fix its output wavelength at a specified point.
  • a spectrum-sliced system which uses a broad-band light source instead of wavelength-specified light source, has been demonstrated to reduce the cost and the complexity of system.
  • Incoherent broad-band light sources such as a light emitting diode(LED), a super-luminescent diode(SLD), and optical amplifiers emitting amplified spontaneous emissions(ASEs) are representative light sources being used for spectrum-sliced system. Spectrum-sliced systems using these light sources are very attractive since they are able to simply the wavelength control process compared with the distributed feed-back laser diode.
  • US Patent 5,440,417 (System for spectrum-sliced fiber amplifier light for multi-channel wavelength-division-multiplexed applications) discloses a method of spectrum-slicing by using optical amplifier light source.
  • US Patent 5,694, 234 (Wavelength division multiplexing passive optical network including broadcast overlay) discloses a spectrum-sliced system by using a directly-modulated LED.
  • LED or an SLD hardly provides sufficient output power and an optical amplifier light source requires an expensive external modulator even though its output power is comparatively large.
  • a wavelength-tunable light source improves the functionality of a wavelength-division multiplexed transmission system.
  • DFBLD distributed feed-back laser diode
  • wavelength-tunable light sources employing an external cavity have been mainly studied in the prior art, however, they are costly and require complex devices to tune the output wavelength.
  • the present invention is proposed to solve the problems of the prior art mentioned above.
  • the present invention presents a wavelength-tunable light source using a Fabry-Perot laser diode and a wavelength-division multiplexed transmission system employing the light source.
  • a Fabry-Perot laser diode can provide higher output power than both
  • LED and SLD is relative simple to manufacture compared with a distributed feed-back laser diode(DFBLD).
  • DFBLD distributed feed-back laser diode
  • KR Patent 1003256870000 A light source for wavelength- division multiplexed telecommunication system using a Fabry-Perot laser diode wavelength-locked by an injected incoherent light, registered at Feb. 8, 2002
  • KR Patent 1003256870000 A light source for wavelength- division multiplexed telecommunication system using a Fabry-Perot laser diode wavelength-locked by an injected incoherent light, registered at Feb. 8, 2002
  • KR Patent 1003256870000 A light source for wavelength- division multiplexed telecommunication system using a Fabry-Perot laser diode wavelength-locked by an injected incoherent light, registered at Feb. 8, 2002
  • KR Patent 1003256870000 A light source for wavelength- division multiplexed telecommunication system using a Fabry-Perot laser diode wavelength-locked by an injected incoherent light, registered at Feb. 8, 2002
  • KR Patent 1003256870000 A light source for wavelength- division multiplexed telecommunication
  • the characteristics of the wavelength-tunable light source such as side mode suppression ratio, noise property, and output power can be optimized by controlling the temperature of a Fabry-Perot laser diode.
  • FIG. 1 is a schematic diagram of an embodiment of a wavelength- tunable light source in accordance with the present invention .
  • FIG. 2 is a schematic diagram of an experimental setup for measuring the characteristics of an embodiment of a wavelength-tunable light source in accordance with the present invention .
  • FIG. 3a ⁇ FIG. 3c are optical spectra measured by the experimental setup described in FIG. 2.
  • FIG 4a ⁇ FIG. 4b are optical spectra measured by the experimental setup described in FIG. 2 with a different optical filter.
  • FIG. 5a is an experimental setup for measuring an eye diagram in a prior spectrum-sliced system and
  • FIG. 5b is an experimental setup for measuring an eye diagram of a light source in accordance with the present invention.
  • FIG. 6a and FIG. 6b are eye diagrams measured by the experimental setup described in FIG. 5a and FIG. 5b respectively.
  • FIG. 7 is the first embodiment of a wavelength-division multiplexed transmission system in accordance with the present invention .
  • FIG. 8 is the second embodiment of a wavelength-division multiplexed transmission system in accordance with the present invention.
  • FIG. 9 is the third embodiment of a wavelength-division multiplexed transmission system in accordance with the present invention.
  • FIG. 1 0 is the fourth embodiment of a wavelength-division multiplexed transmission system in accordance with the present invention .
  • FIG. 1 1 is the fifth embodiment of a wavelength-division multiplexed transmission system using a light source in accordance with the present invention.
  • BLS a broad-band light source
  • EDFA a two-stage Erbium-doped fiber amplifier
  • EM an external modulator EMDR : an external modulator driving circuit FPLD : a Fabry-Perot laser diode
  • OSA an optical spectrum analyzer
  • RX an optical receiver
  • TBPF a tunable band-pass filter
  • TEC a temperature controller
  • WDM a wavelength-division multiplexer
  • a wavelength-tunable light source in accordance with the present invention comprises a broad-band light source(BLS), a tunable band-pass filter(TBPF), an optical circulator and a Fabry-Perot laser diode.
  • a broad-band light source is either one of a incoherent light sources such as a fiber optical amplifier emitting amplified spontaneous emissions, a semiconductor optical amplifier, a light emitting diode and a super-luminescent or a coherent light source super continuum source. It is desirable that a Fabry-Perot laser diode(FPLD) should not contain an optical isolator for a efficient light injection.
  • a tunable band-pass filter(TBPF) selectively passes the light to be injected.
  • a Fabry-Perot laser diode(FPLD) is a multi-mode light source without an external light being injected thereto, however, if a light is injected thereto from outside, among the oscillation modes of the Fabry-Perot laser diode, a mode or modes within the range of the injected light will output relatively high power while the modes out of the range will be suppressed.
  • a wavelength-selective output is outputted through an optical circulator(OC) connected to a Fabry-Perot laser diode(FPLD).
  • a Fabry-Perot laser diode FPLD
  • the output wavelength of the light source is determined by the light injected into a Fabry-Perot laser diode(FPLD), it can be tuned by controlling the band-pass of a tunable band-pass filter(TBPF).
  • the wavelengths of cavity modes of a Fabry-Perot laser diode(FPLD) vary according to the temperature of the Fabry-Perot laser diode. With this characteristic, the characteristics of a wavelength-tunable light source such as side mode suppression ratio, noise property, output power, and output spectrum can be controlled by controlling the temperature of a Fabry-Perot laser diode(FPLD).
  • the characteristics of a wavelength-tunable light source such as side mode suppression ratio, noise property, output power, and output spectrum also can be controlled by controlling the temperature of a Fabry-Perot laser diode(FPLD).
  • FPLD Fabry-Perot laser diode
  • the output power of the wavelength-tunable light source varies as the bias current applied to a Fabry-Perot laser diode(FPLD).
  • FPLD Fabry-Perot laser diode
  • the output of a wavelength-tunable light source is polarized, however, the reflected injection can be unpolarized.
  • the extinction ratio of a modulated optical signal can be improved by additionally installing a polarization controller and a polarizer at the output port of an optical circulator(OC).
  • the extinction ratio of the output of a wavelength-tunable light source can be maximized.
  • an optical circulator(OC) is used to reduce optical insertion losses.
  • FIG. 2 shows an experimental setup for measuring the characteristics of an embodiment of a wavelength-tunable light source in accordance with the present invention.
  • a two-stage Erbium-doped fiber amplifier(EDFA) is used for an borad- band light source(BLS) in FIG. 1 , and a Fabry-Perot etalon filter is used for a tunable band-pass filter(TBPF).
  • EDFA Erbium-doped fiber amplifier
  • BSS borad- band light source
  • TBPF Fabry-Perot etalon filter
  • the two-stage Erbium-doped fiber amplifier(EDFA) outputs amplified spontaneous emission(ASE), which is a incoherent light having a band- width larger than 30nm.
  • a Fabry-Perot etalon filter(FPEF) with a 3-dB band-width of about 2.5GHz selectively passes erbium-doped fiber amplifier(EDFA) output and the pass-band can be controlled by applying the voltage.
  • the power of the incoherent light injected into a Fabry-Perot laser diode(FPLD) through an optical circulator(OC) is -2dBm
  • the threshold current of the Fabry-Perot laser diode(FPLD) is 10mA
  • a bias current of 17mA is applied thereto.
  • the cavity length of the Fabry-Perot laser diode(FPLD) is about 400 urn and the mode spacing is about 100 GHz, which corresponds to 40 times of the 3-dB band-width of the Fabry-Perot etalon filter(FPEF).
  • OSA represents an optical spectrum analyzer
  • FIG. 3a shows output spectra of a Fabry-Perot laser diode(FPLD) measured without an ASE injection
  • FIG. 3b shows the spectra of lights injected into a Fabry-Perot laser diode
  • FIG. 3c shows the output spectra of a wavelength-tunable light source after the lights in FIG. 3b being injected thereto respectively.
  • the peak wavelengths of the lights injected into a Fabry-Perot laser diode(FPLD) are 1530nm, 1545nm and 1560nm, respectivly, and the temperature of the Fabry-Perot laser diode(FPLD) was set for the side mode suppression ratio measured in FIG. 3c to be maximized in each case.
  • a Fabry-Perot laser diode After a light injection, a Fabry-Perot laser diode provides a wavelength- selected output with a specific wavelength according to the wavelength of the injected light.
  • the side mode suppression ratios measured are more than 30dB and the output powers were about OdBm. Therefore, it can be noticed that a light source in accordance with the present invention provides a narrow-band output with about more than 30nm of wavelength-tunable range.
  • FIG 4a is an optical spectrum measured by the experimental setup described in FIG. 2 with a different optical filter, whose 3-dB bandwidth is about 100 GHz.
  • the center wavelength of the filter is about 1558.8 nm.
  • the 3-dB bandwidth of the filter is comparable to the mode spacing of a of the Fabry-Perot laser diode(FPLD).
  • the light source in accordance with the present invention is can be realized while a light with a 3-dB bandwidth of several times of the mode spacing of
  • Fabry-Perot laser diode is injected into the Fabry-Perot laser diode.
  • FIG. 4b is an optical spectrum measured by the same experimental setup, however, the temperature of the Fabry-Perot laser diode is tuned in order that the center wavelength of the injected light corresponds to the a mid-point of two cavity modes.
  • the light source provides a wavelength-selective output.
  • a Fabry-Perot laser diode(FPLD) used for a wavelength-tunable light source in accordance with the present invention can suppress the intensity noise of an injected incoherent light.
  • a Fabry-Perot laser diode suppresses intensity noise of the injected incoherent light.
  • An experimental setup can be constituted for confirming this characteristic as described in FIG. 5.
  • the experimental setup described in FIG. 5a is for a prior spectrum- sliced system, which uses an external modulator(EM) followed by a tunable band-pass filter(TBPF) modulates narrow-band incoherent filter and thereafter measures its eye diagram using an oscilloscope(OSC).
  • EM external modulator
  • TBPF tunable band-pass filter
  • the experimental setup described in FIG. 5b is for a wavelength-tunable light source in accordance with the present invention, which injects an incoherent into a Fabry-Perot laser diode(FPLD), directly modulates the
  • a Fabry-Perot etalon filter(FPEF) with a 3-dB bandwidth of about 2.5 GHz was used as a tunable band-pass filter(TBPF).
  • the modulation bit rate were 622Mb/s and the length of pseudo-random block signal(PRBS) applied to the external modulator or the Fabry-Perot laser diode(FPLD) was 2 31 -1 .
  • FIG. 6a and FIG. 6b are showing the eye diagrams measured in both cases respectively.
  • a wavelength-tunable light source in accordance with the present invention is suppressing the intensity noise of the incoherent light.
  • a wavelength-tunable light source in accordance with the present invention can be used for various applications in a wavelength-division multiplexed transmission system.
  • FIG. 7 shows the first embodiment of a wavelength-division multiplexed transmission system using a light source in accordance with the present invention, which outputs N first-group wavelength-division-multiplexed optical signals( ⁇ - ⁇ , ⁇ 3 , ...
  • a wavelength-division multiplexed transmission system in accordance with the present invention comprises N Fabry-Perot laser diodes(FPLD 1 , FPLD2, ... , FPLDn), N laser diode driving circuits(DR1 , DR2, ... , DRn), N laser diode temperature controllers(TEC 1 , TEC2, ... , TECn), N optical receivers(RX1 , RX2, ...
  • a (de)multiplexer((D)MUX1 ) demultiplexes wavelength-division multiplexed optical signals inputted through a common and outputs them through 2N input/output ports respectively. Or, it multiplexes the optical signals having different wavelengths, which are inputted through 2N input/output ports respectively, and outputs them through the common port.
  • the wavelengths of the first-group optical signals( ⁇ - ⁇ , ⁇ 3 , ... , ⁇ 2N - ⁇ ) and the second-group optical signals( ⁇ 2 , ⁇ 2 N) are arranged to be interlaid.
  • the first-group optical signals( ⁇ - ⁇ , ⁇ 3 , ... , ⁇ 2N _ ) can be transferred between a common port and odd-numbered ports(1 , 3, ... , 2N- 1 ) of a (de)multiplexer((D)MUX1 ) and the second-group optical signals( ⁇ 2 , ⁇ 4 , ... , ⁇ 2N ) can be transferred between a common port and even- numbered ports(2, 4, ... , 2N) of a (de)multiplexer.
  • An broad-band light source(BLS) emits a wide-band light.
  • the optical circulator(OC) outputs the optical signals inputted through the first port through the second port and the optical signals inputted through the second port through the third port.
  • the wavelength interleavers(IL1 , IL2) transfer the first-group optical signals( ⁇ - ⁇ , ⁇ 3 , ... , ⁇ 2N - ⁇ ) and block the second-group optical signals( ⁇ 2 , ⁇ 4 , ... , ⁇ 2N ) between the first port and the second port, and on the other hand, they transfer the second-group optical signals( ⁇ 2 , ⁇ 4 , ... , ⁇ 2N ) and block the first-group optical signals( ⁇ - ⁇ , ⁇ 3 , ... , ⁇ 2N - ⁇ ) between the first port and the third port.
  • connection of a transmission system(100) described above can be performed as follows:
  • N Fabry-Perot laser diodes (FPLD1 , FPLD2, ... , FPLDn) are connected to the odd-numbered ports of a (de)multiplexer((D)MUX1 ), and N optical receivers(RX1 , RX2, ... , RXn) are connected to the even-numbered ports of the (de)multiplexer((D)MUX1 ) respectively.
  • the common port of a (de)multiplexer((D)MUX1 ) is connected to the first port of a first wavelength interleaver(ILI ), the second port of the first wavelength interleaver(ILI ) is connected to the second port of an optical circulator(OC), the first port of the optical circulator(OC) is connected to an broad-band light source(BLS) and the third port of the optical circulator(OC) is connected to the second port of a second wavelength interleaver(IL2).
  • the third port of the first wavelength interleaver(ILI ) and the third port of the second wavelength interleaver(IL2) are connected to each other, and the first port of the second wavelength interleaver(IL2) becomes an output port of a transmission system(100).
  • an broad-band light source(BLS) emits a wide-band light
  • the emitted light is then inputted through the first port of an optical circulator(OC), passing through the second port, and then inputted into the second port of a first wavelength interleaver(ILI ).
  • the first wavelength interleaver(ILI ) outputs some portion of the inputted wide-band light through the first port.
  • the output from the first wavelength interleaver(ILI ) is inputted into the common port of a (de)multiplexer((D)MUX1 ), and outputted through corresponding odd-numbered ports of the (de)multiplexer((D)MUX1 ) respectively.
  • the outputs from the (de)multiplexer((D)MUX1 ) are inputted into N Fabry-Perot laser diodes(FPLD1 , FPLD2, ... , FPLDn) respectively, and then N Fabry-Perot laser diodes(FPLD1 , FPLD2, ..., FPLDn) output first- group optical signals( ⁇ - ⁇ , ⁇ 3 , ... , ⁇ 2N - ⁇ ) whose wavelengths are within the pass-bands of the odd-numbered ports of the (de)multiplexer((D)MUX1 ) respectively.
  • the first-group optical signals( ⁇ , ⁇ 3 , ... , ⁇ 2 N- ⁇ ) are multiplexed by the (de)multiplexer((D)MUX1 ), and then inputted into the first port of the first wavelength interleaver(ILI ).
  • the first-group optical signals( ⁇ - ⁇ , ⁇ 3 ⁇ 2N -- ⁇ ) inputted into the first wavelength interleaver(ILI ) are outputted through the second port, passing through the second port and the third port of the optical circulator(OC), and then inputted into the second port of a second wavelength interleaver(IL2) to be outputted through the first port of the second wavelength interleaver(IL2).
  • the second-group optical signals( ⁇ 2 , ⁇ , ... , ⁇ 2 ) inputted into the first port of the second wavelength interleaver(IL2) are outputted through the third port, and then inputted into the third port of the first wavelength interleaver(ILI ) to be outputted through the first port, and thereafter inputted into the common port of the (de)multiplexer((D)MUX1 ).
  • the second-group optical signals( ⁇ 2 , ⁇ 4 , ... , ⁇ 2 ) inputted through the common port are outputted through the corresponding even-numbered ports of the (de)multiplexer((D)MUX1 ), and then received by optical receivers(RX1 , RX2, ... , RXn) respectively.
  • the transmission system(100) may further comprise N laser diode driving circuits(DR1 , DR2, ... , DRn) to modulate N Fabry-Perot laser diodes N Fabry-Perot laser diodes(FPLD1 , FPLD2, ... , FPLDn), N laser diode temperature controllers(TEC1 , TEC2, ... , TECn) for controlling the temperatures of N Fabry-Perot laser diodes(FPLD1 , FPLD2, ... , FPLDn) and a temperature controller(TEC) for controlling the temperature of the (de)multiplexer((D)MUX1 ).
  • N laser diode driving circuits(DR1 , DR2, ... , DRn) to modulate N Fabry-Perot laser diodes N Fabry-Perot laser diodes(FPLD1 , FPLD2, ... , FPLDn)
  • FIG. 8 shows the second embodiment of a wavelength-division multiplexed transmission system using a light source in accordance with the present invention, which outputs N third-group wavelength-division- multiplexed optical signals( ⁇ , ⁇ 2 , ... , ⁇ ) through an optical fiber and receives N fourth-group wavelength-division-multiplexed optical signals( ⁇ N+ ⁇ , ⁇ N4 -2, • • • , ⁇ 2N ) inputted through the fiber.
  • a wavelength-division multiplexed transmission system in accordance with the present invention comprises N Fabry-Perot laser diodes(FPLD1 , FPLD2, ... , FPLDn), N laser diode driving circuits(DR1 , DR2, ... , DRn), N laser diode temperature controllers(TEC1 ,
  • a (de)multiplexer((D)MUX1 ) demultiplexes wavelength-division multiplexed optical signals inputted through a common port and outputs them through 2N input/output ports respectively. Or, it multiplexes the optical signals having different wavelengths, which are inputted through 2N input/output ports respectively, and outputs them through the common port.
  • the wavelengths of the third-group optical signals( ⁇ , ⁇ 2 , ... , ⁇ ) and the fourth-group optical signals( ⁇ N+ ⁇ , ⁇ N+2, • •• , ⁇ 2 N) are arranged in different wavelength-bands respectively.
  • the third-group optical signals( ⁇ , ⁇ 2 ⁇ n) can be transferred between a common port and the (first ⁇ N-th) ports of a (de)multiplexer((D)MUX1 ) and the fourth-group optical signals( ⁇ N+ ⁇ , ⁇ N+2, ... , 2 ) can be transferred between a common port and the (N+1 -th ⁇ 2N-th) ports of a (de)multiplexer.
  • An broad-band light source(BLS) emits a wide-band light.
  • the optical circulator(OC) outputs the optical signals inputted through the first port through the second port and the optical signals inputted through the second port through the third port.
  • the wavelength-division multiplexers(WDM1 , WDM2) transfer the third- group optical signals( ⁇ - ⁇ , ⁇ 2 , ... , ⁇ n) and block the fourth-group optical signals( ⁇ N+ ⁇ , ⁇ N+2 ⁇ 2N) between the first port and the second port, and on the other hand, they transfer the fourth-group optical signals( ⁇ N+ ⁇ , ⁇ +2 ,
  • N Fabry-Perot laser diodes (FPLD1 , FPLD2, ... , FPLDn) are connected to the (first ⁇ N-th) ports of a (de)multiplexer((D)MUX1 ), and N optical receivers(RX1 , RX2, ... , RXn) are connected to the (N+1 -th ⁇ 2N-th) ports of the (de)multiplexer((D)MUX1 ) respectively.
  • the common port of a (de)multiplexer((D)MUX1) is connected to the first port of a first wavelength-division multiplexer(WDMI), the second port of the first wavelength-division multiplexer(WDMI ) is connected to the second port of an optical circulator(OC), the first port of the optical circulator(OC) is connected to an broad-band light source(BLS) and the third port of the optical circulator(OC) is connected to the second port of a second wavelength-division multiplexer(WDM2).
  • the third port of the first wavelength-division multiplexer(WDMI ) and the third port of the second wavelength-division multiplexer(WDM2) are connected to each other, and the first port of the second wavelength- division multiplexer(WDM2) becomes an output port of a transmission system(100).
  • the output of an broad-band light source(BLS) is inputted through the first port of an optical circulator(OC), passing through the second port, and then inputted into the second port of a first wavelength-division multiplexer(WDM I ).
  • the first wavelength-division multiplexer(WDMI ) outputs some portion of the inputted wide-band light through the first port.
  • the output from the first wavelength-division multiplexer(WDMI ) is inputted into the common port of a (de)multiplexer((D)MUX1 ), and outputted through the corresponding (first ⁇ N-th) ports of the
  • the outputs from the (de)multiplexer((D)MUX1 ) are inputted into N Fabry-Perot laser diodes(FPLD1 , FPLD2, ... , FPLDn) respectively, and then N Fabry-Perot laser diodes(FPLD1 , FPLD2 FPLDn) output third- group optical signals( ⁇ , ⁇ 2 , ... . ⁇ N ) whose wavelengths are within the pass-bands of the (first ⁇ N-th) ports of the (de)multiplexer((D)MUX1 ) respectively.
  • the third-group optical signals( ⁇ - ⁇ , ⁇ 2 , .... ⁇ ) are multiplexed by the (de)multiplexer((D)MUX1 ), and then inputted into the first port of the first wavelength-division multiplexer(WDMI ).
  • the third-group optical signals( ⁇ - ⁇ , %2 ⁇ N) inputted into the first wavelength-division multiplexer(WDMI ) are outputted through the second port, passing through the second port and the third port of the optical circulator(OC), and then inputted into the second port of a second wavelength-division multiplexer(WDM2) to be outputted through the first port of the second wavelength-division multiplexer(WDM2).
  • the fourth-group optical signals( ⁇ N+ ⁇ , ⁇ w+2, ••• , ⁇ 2 N) inputted into the first port of the second wavelength-division multiplexer(WDM2) are outputted through the third port, and then inputted into the third port of the first wavelength-division multiplexer(WDMI ) to be outputted through the first port, and thereafter inputted into the common port of the (de)multiplexer((D)MUX1 ).
  • the signals inputted through the common port are outputted through the corresponding (N+1 -th ⁇ 2N-th) ports of the (de)multiplexer((D)MUX1 ) and received by optical receivers(RX1 , RX2, ... ,
  • RXn connected to the ports respectively.
  • the transmission system(100) may further comprise N laser diode driving circuits(DR1 , DR2, ... , DRn) to modulate N Fabry-Perot laser diodes(FPLD1 , FPLD2, ... , FPLDn), N laser diode temperature controllers(TEC1 , TEC2, ... , TECn) for controlling the temperatures of N
  • Fabry-Perot laser diodes (FPLD1 , FPLD2, ... , FPLDn) and a temperature controller(TEC) for controlling the temperature of the (de)multiplexer((D)MUX1 ).
  • FIG. 9 shows a third embodiment of a wavelength-division multiplexed transmission system using a light source in accordance with the present invention, which outputs N fifth-group wavelength-division-multiplexed optical signals( ⁇ , ⁇ 2 , ... , ⁇ N) through an optical fiber and receives N sixth- group wavelength-division-multiplexed optical signals( ⁇ N+ ⁇ , ⁇ +2, •• ⁇ , ⁇ 2N ) inputted through the fiber.
  • a wavelength-division multiplexed transmission system in accordance with the present invention comprises N Fabry-Perot laser diodes(FPLD1 , FPLD2, ... , FPLDn), N laser diode driving circuits(DR1 , DR2, ... , DRn), N laser diode temperature controllers(TEC1 , TEC2, ... , TECn), N optical receivers(RX1 , RX2 RXn), an N ⁇ 1
  • a (de)multiplexer((D)MUX2) demultiplexes wavelength-division multiplexed optical signals inputted through a common port and outputs them through N input/output ports respectively. Or, it multiplexes the optical signals having different wavelengths, which are inputted through N input/output ports respectively, and outputs them through the common port.
  • the signal transfer characteristics between the common port and each input/output port are repeated with a wavelength interval of l(an arbitrary integer) times the free spectral range of the (de)multiplexer((D)MUX2).
  • the wavelengths of the fifth-group optical signals( ⁇ - ⁇ , ⁇ 2 ⁇ N ) and the sixth-group optical signals( ⁇ N+ ⁇ , ⁇ N+2, ••• , ⁇ 2N) are arranged in different wavelength-bands respectively.
  • Both the fifth-group optical signals( ⁇ , ⁇ 2 , ... , ⁇ jsi) and the sixth-group optical signals( ⁇ N+ ⁇ , ⁇ N+2, ... , ⁇ 2 N) can be transferred between a common port and N input/output ports of a (de)multiplexer((D)MUX2), however, the wavelengths of the fifth-group optical signals( ⁇ , ⁇ 2 , ...
  • the optical circulator(OC) outputs the optical signals inputted through the first port through the second port and the optical signals inputted through the second port through the third port.
  • the wavelength-division multiplexers(WDM1 , ... , WDMn+1 , WDMn+2) transfer the fifth-group optical signals( ⁇ - ⁇ , ⁇ 2 , ... , ⁇ u) and block the sixth- group optical signals( ⁇ N+ ⁇ , ⁇ N+2, • ⁇ • , ⁇ 2 N) between the first port and the second port, and on the other hand, they transfer the sixth-group optical signals( ⁇ N+ ⁇ , ⁇ +2, • • • , ⁇ 2 N) and block the fifth-group optical signals( ⁇ , ⁇ 2 , ... , ⁇ ivi) between the first port and the third port.
  • N input/output ports of a (de)multiplexer((D)MUX2) are connected to the first ports of N wavelength-division multiplexers(WDM3, ... , WDMn+1 , WDMn+2)
  • N Fabry-Perot laser diodes (FPLD1 , FPLD2, ... , FPLDn) are connected to the second ports of N wavelength-division multiplexers(WDM3, ... , WDMn+1 , WDMn+2)
  • N optical receivers(RX1 , RX2, ... , RXn) are connected to the third ports of N wavelength-division multiplexers(WDM3, ... , WDMn+1 , WDMn+2) respectively.
  • the common port of a (de)multiplexer((D)MUX2) is connected to the first port of a first wavelength-division multiplexer(WDMI ), the second port of the first wavelength-division multiplexer(WDMI ) is connected to the second port of the optical circulator(OC), the first port of an optical circulator(OC) is connected to an broad-band light source(BLS) and the third port of the optical circulator(OC) is connected to the second port of a second wavelength-division multiplexer(WDM2).
  • the third port of the first wavelength-division multiplexer(WDMI ) and the third' port of the second wavelength-division multiplexer(WDM2) are connected to each other, and the first port of the second wavelength- division multiplexer(WDM2) becomes an output port of a transmission system(100).
  • the output of an broad-band light source(BLS) is inputted through the first port of an optical circulator(OC), passing through the second port, and then inputted into the second port of a first wavelength-division multiplexer(WDMI ).
  • the first wavelength-division multiplexer(WDMI ) outputs some portion of the inputted light through the first port.
  • the output from the first wavelength-division multiplexer(WDMI ) is inputted into the common port of a (de)multiplexer((D)MUX2), and then outputted through the corresponding input/output ports of the
  • (de)multiplexer((D)MUX2) respectively.
  • the outputs from the (de)multiplexer((D)MUX2) are inputted into the first ports of N wavelength-division multiplexers(WDM3 WDMn+1 ,
  • N Fabry-Perot laser diodes (FPLD1 , FPLD2, ... , FPLDn) respectively.
  • N Fabry-Perot laser diodes (FPLD1 , FPLD2, ... , FPLDn) output fifth- group optical signals( ⁇ , %2, .... ⁇ n) whose wavelengths are within the pass-bands of the N input/output ports of the (de)multiplexer((D)MUX2) respectively.
  • the fifth-group optical signals( ⁇ - ⁇ , ⁇ 2 ⁇ N) are transferred through N wavelength-division multiplexers(WDM3, ... , WDMn+1 , WDMn+2) to be inputted into the (de)multiplexer((D)MUX2) and multiplexed therein. Then the multiplexed signals are inputted into the first port of the first wavelength-division multiplexer(WDMI ).
  • the fifth-group optical signals( ⁇ , ⁇ 2 , ... , ⁇ ) inputted into the first wavelength-division multiplexer(WDMI ) are outputted through the second port, passing through the second port and the third port of the optical circulator(OC), and then inputted into the second port of the second wavelength-division multiplexer(WDM2) to be outputted through the first port of the second wavelength-division multiplexer(WDM2).
  • the sixth-group optical signals( ⁇ N +1 , ⁇ N +2, ••- , ⁇ 2N) inputted into the first port of the second wavelength-division multiplexer(WDM2) are outputted through the third port, and then inputted into the third port of the first wavelength-division multiplexer(WDMI ) to be outputted through the first port, and thereafter inputted into the common port of the (de)multiplexer((D)MUX2).
  • the sixth-group optical signals( ⁇ N+ ⁇ , ⁇ N+2, • ⁇ • > 2N) inputted through the common port are outputted through the corresponding input/output ports of the (de)multiplexer((D)MUX2) to be inputted into the first ports of N wavelength-division multiplexers(WDM3, ... , WDMn+1 , WDMn+2) respectively.
  • the sixth-group optical signals( ⁇ N+ ⁇ , ⁇ N +2 , ... , inputted into N wavelength-division multiplexers(WDM3, ... , WDMn+1 , WDMn+2) are then outputted through the third ports of the wavelength-division multiplexers to be received by optical receivers(RX1 , RX2, ...
  • the transmission system(100) may further comprise N laser diode driving circuits(DR1 , DR2, ... , DRn) to modulate N Fabry-Perot laser diodes(FPLD1 , FPLD2 FPLDn), N laser diode temperature controllers(TEC1 , TEC2 TECn) for controlling the temperatures of N
  • Fabry-Perot laser diodes (FPLD1 , FPLD2, ... , FPLDn) and a temperature controller(TEC) for controlling the temperature of the (de)multiplexer((D)MUX2).
  • FIG. 10 is the fourth embodiment of a wavelength-division multiplexed transmission system using a light source in accordance with the present invention.
  • a wavelength-division multiplexed transmission system in accordance with the present invention comprises N Fabry-Perot laser diodes(FPLD1 , FPLD2, ... , FPLDn), N laser diode temperature controllers(TEC1 , TEC2, ... , TECn), an N ⁇ 1 (de)multiplexer((D)MUX2), a (de)multiplexer temperature controller(TEC), an optical circulator(OC), an broad-band light source(BLS), an external modulator(EM), and an external modulator driving circuit(EMDR).
  • a (de)multiplexer((D)MUX2) demultiplexes wavelength-division multiplexed optical signals inputted through a common port and outputs them through N input/output ports respectively. Or, it multiplexes the optical signals having different wavelengths, which are inputted through N input/output ports respectively, and outputs them through the common port.
  • An broad-band light source(BLS) emits a wide-band light.
  • the optical circulator(OC) outputs the optical signals inputted through the first port through the second port and the optical signals inputted through the second port through the third port.
  • connection of a transmission system(100) described above can be performed as follows:
  • N Fabry-Perot laser diodes (FPLD1 , FPLD2, ... , FPLDn) are connected to N ports of a (de)multiplexer((D)MUX2) respectively, and the common port of the (de)multiplexer((D)MUX2) is connected to the second port of an optical circulator(OC).
  • the first port of the optical circulator(OC) is connected to an broad-band light source(BLS) and the third port of the optical circulator(OC) is connected to an external modulator(EM).
  • An external modulator driving circuit(EMDR) is connected to the external modulator(EM), and thus electric signals are inputted into the external modulator driving circuit(EMDR) and modulated optical signals are outputted through the external modulator(EM).
  • the output of an broad-band light source(BLS) is inputted through the first port of an optical circulator(OC), passing through the second port to be inputted into the common port of a (de)multiplexer((D)MUX2), and then outputted through the corresponding N ports of (de)multiplexer((D)MUX2) respectively.
  • the outputs from the (de)multiplexer((D)MUX2) are inputted into N Fabry-Perot laser diodes(FPLD1 , FPLD2, ... , FPLDn) respectively, and each of the Fabry-Perot laser diodes(FPLD1 , FPLD2, ... , FPLDn) outputs optical signals whose wavelengths are within the within the pass-bands of the N ports of a (de)multiplexer((D)MUX2) respectively.
  • N Fabry-Perot laser diodes (FPLD1 , FPLD2, ... , FPLDn) are multiplexed by the (de)multiplexer((D)MUX2), passing through the optical circulator(OC), and then inputted into the external modulator(EM). Then, the external modulator(EM) modulates the inputted optical signals, with using the received electric signals, and outputs the modulated signals.
  • the external modulator(EM) modulates the inputted optical signals, with using the received electric signals, and outputs the modulated signals.
  • a transmission system(100) of the present invention further comprises N polarization controllers(PC1 , PC2, ... , PCn) connected between the input/output ports of a (de)multiplexer((D)MUX2) and N Fabry-Perot laser diodes(FPLD1 , FPLD2, ... , FPLDn) or a polarization controller(PC) connected between an external modulator(EM) and an optical circulator(OC).
  • N polarization controllers PC1 , PC2, ... , PCn
  • FPLD1 , FPLD2, ... , FPLDn N polarization controller
  • the transmission system(1 00) further comprises N laser diode temperature controllers(TEC1 , TEC2, ... , TECn) for controlling the temperatures of N Fabry-Perot laser diodes(FPLD1 , FPLD2, ... , FPLDn) and a temperature controller(TEC) for controlling the temperature of a
  • FIG. 12 shows the fifth embodiment of a wavelength-division multiplexed transmission system using a light source in accordance with the present invention, which further comprises an optical receiver(RX) with the structure of a transmission system described in FIG. 1 0.
  • RX optical receiver
  • An optical receiver(RX) converts the input optical signals into electric signals.
  • the system can converts the signal into electric signal, and then converts it back to the optical signal(s) with a(or more than 2) wavelength(s).
  • the wavelengths of optical signals outputted through an external modulator(EM) can be varied by controlling the currents applied to the Fabry-Perot laser diodes(FPLD1 , FPLD2, ... , FPLDn).
  • a transmission system using a light source in accordance with the present invention reduces the cost per channel. Moreover, it can increase the output power, and thus it makes it easy to constitute a transmission system and expand the network coverage.
  • a wavelength-division multiplexed transmission system in accordance with the present invention is constituted for wavelength- division multiplexed optical signals to be inputted and/or outputted through the same optical fiber, and thus it can reduce the number of fibers required for optical communication to be half of that of the prior art.

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US7349631B2 (en) 2008-03-25
AU2003217510A1 (en) 2003-12-31
US7613398B2 (en) 2009-11-03
KR20030086223A (ko) 2003-11-07
US20070081823A1 (en) 2007-04-12
US20030206740A1 (en) 2003-11-06
US7327957B2 (en) 2008-02-05
US20080232805A1 (en) 2008-09-25

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